Patients in Intensive Care Units are often extremely thirsty due to their medicines, illness, treatments or medicines that they receive. This study will test whether patients who receive a easy to implement intervention for thirst will have greater relief from thirst than a group of patients who do not receive the intervention. The study will also identify the most important factors that make ICU patients thirsty so that future research studies can test how to relieve those factors and/or make interventions for thirst more readily available.